Eudolph vollschwitz



t @einen faire datent @fitte RUDOLPH VOLLSOHWITZ, OF NEW YORK, N. Y., ASSIGNOR -TO HIMSELF v.AND J. J. SOHLAEPFER, OF SAME PLACE.

Letters Patent 1%. 60,970, dated January 1, 1867.

IMPROVEMENT IN DOOR LOOKS.

@te tlgehll march it in tigen tetters @tout mit mating .petti tlge 5mm.

TO ALL WHOM IT MAY CONOERN Be itknown that I, YRUDOLPH VOLnSCHWITz, of the city, county, and State of 'N ew York, have invented a new and useful AImprovement in Locks; Aand I do hereby declare thatthe following is a full,v clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in which- Figure l represents an .elevation of this invention, one-half of the case havin-g been removed to expose the internal mechanism. i

. Figure 2 is a similar View, the. tumhlers 'having been removed to expose the parts below.

Figure 3 is a transverse section of the same, the line a: x, iig.' l, indicating the plane of section.

Figures 4, 5, and 6 are detached views of the tumbler.

Similar letters of reference indicate like parts.

This invention relates to a look, the mechanism of which is Aenclosed in a cylindrical case; `said mechanism being composed of three (more or less) tumblers, which are provided with slots to admit the key, so that by turning said key the heads of the tumbler-s arrange themselves in the proper position to allowthe bolt to move in or out. An elastic pad or spring, which bears on the ends of the several tumblers. has a tendency to keep the same .in such a positio'n that their slots coincide to admit the key, and that their heads prevent the bolt from moving, the whole mechanism being so arranged that it takes but little room, and that a safe lock with a small and convenient key can be produced at a comparatively small cost.

A represents a tubular or cylindrical case, which is secured to the face-plate B, and which enclosesthe mechanism of my look. C is ,the bolt, the head of which is tted in a square mortise in theface-plate of the lock in the usual manner. The shank of this boltextends back in the case, and from its surface rise three lugs, aa b', two on one-'side of the key-hole c and one behind, as shown particularly in g. 2 of the drawing. The lugs a a are arranged one opposite the other, or they may be placed in any convenient position, and they form the abntments for' the'shoulder d ol on the tnmblers D. These tumblers are secured to a pivot e near the rear end of the case, and their ends bearagainst a block, f, of India rubber, or of any other elastic material, whereby said tumblers are brought in sucla position that their shoulders-catch over the )edges of the lugs a a, in front or behind, according to the position ofthe bolt, and the motion of said bolt is rendered impossible until all the tumblers are brought in such a position that their shoulders clear the lugs a a. This purpose is effected by the action of a key, K, the bit of which extends in the direction of its shank, and is equal in width to the diameter oi said shank, so that it can be conveniently carried in the pocket. Said bit is introduced through the `key-hole c in the case or in the nut from either side, and it passes through mortises g in the tumblers, which are so arranged that in turning the key the notched edges of the bit act on the inner edges of said mortises, and thereby the .tumblers are brought in such a position that the shoulders d d clear the lugs a a, and the bolt is free to move in or out. The motion of the bolt is eected by the action of a nut, E, which is situated between the tumblers' and the shank of the bolt, and which is provided with two wings 7L L that act on thelug b, one to push the bolt out and the other to pushvthe,bolt in. Sai`d`-nutl revolves freely in the case A, and itis providedwith a hole to admit the bit of the key. i This hole corresponds to the key-hole c in the case, and when the key is inserted in the nut and turned the tumbler-s are made to release the bolt, and .then one hof the -wings 1L 7L acts lon the lug b andV moves the bolt in or out as the case'rnay be. The barrel of the nut is viiattened andsubjected tothe action of a spring, z', which has a tendency to h old the nut in position when the bolt is in or out, and to carry the nut back to that'position Whenever it is turned. l

By these means a lock is produced, the mechanism `of lwhich takes up but little room, and with threev or more tumblers, rendering the same safe against burglars; and, furthermore, the key is so shaped that it can be conveniently carried in the pocket. l r

I What I claim asnew, and desire to secure by Letters Patent, is

The mort'ises g inthe tumblers D to operate in combination with the Hat-notched bit of the key, nuts E, and bolt C, substantially as and for thc purpose described.

I RUDOLPH VOLLSOHWITZ.

Witnesses: g v

WM. FJMCNAMARA, ALEX. F. Renners, 

